Android : Response time on inputstream

The main problem I'm having is that, when i try to make a get request on Instagram, averagely i get 250 ms delay. The same call on iOS gets around 50 ms. How can I decrease the delay ?

        HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
        urlConnection.setRequestMethod("GET");
        urlConnection.connect();
        BufferedReader reader = new BufferedReader(new InputStreamReader( urlConnection.getInputStream()));
        char[] buf = new char[2048];
        int charsRead;
        while((charsRead = reader.read(buf, 0, 2048)) > 0) {
            response.append(buf, 0, charsRead);
        }
        reader.close();
        urlConnection.close();

I have tried StringBuilder, HttpGet with HttpResponse( gives the worst delay, 350 ms). Sorry for my English and thanks in advance !